Let Vinay’s age before 10 years be x. So his father’s age before 10 years will be 5x.
After 6 years Vinay’s age will be x+10+6 = x+16 and father’s will be 5x +16.
As per the given condition;
x+16=3/7*(5x+16)
7(x+16)=3(5x+16)
7x+112=15x+48
64=8x
X=8
Father’s present age is 5x+10=5*8+10=40+10 = 50 years